pub unsafe extern "C" fn heif_context_write(
arg1: *mut heif_context,
writer: *mut heif_writer,
userdata: *mut c_void,
) -> heif_errorpub unsafe extern "C" fn heif_context_write(
arg1: *mut heif_context,
writer: *mut heif_writer,
userdata: *mut c_void,
) -> heif_error